Such a warning was made by the late preacher Arthur W. Pink in "Another Gospel":
In contradistinction to the Gospel of Christ, the gospel of Satan teaches salvation by works. It inculcates justification before God on the ground of human merits. Its sacramental phrase is "Be good and do good"; but it fails to recognize that in the flesh there dwelleth no good thing. It announces salvation by character, which reverses the order of God’s Word—character by, as the fruit of, salvation. Its various ramifications and organizations are manifold. Temperance, Reform Movements, "Christian Socialist Leagues," Ethical Culture Societies, "Peace Congresses" are all employed (perhaps unconsciously) in proclaiming this gospel of Satan—salvation by works. The pledge card is substituted for Christ; social purity for individual regeneration, and politics and philosophy, for doctrine and godliness. The cultivation of the old man is considered more practical than the creation of a new man in Christ Jesus; whilst universal peace is looked for apart from the interposition and return of the Prince of Peace.
While doing acts of charity like feeding the poor, helping calamity victims and doing all the good works you can is not bad but it can't be good if the motive itself isn't for God's glory. Charles H. Spurgeon had said that a good work is not wholly good unless it's being done for the glory of God. The difference between world religions and Christianity when it comes to good works is this. What is the motive behind doing good works? It's so often world religions and some who disguise themselves as Christianity mock and false accuse the truth of salvation by grace through faith to be a "license to sin" as much as those other "Christians" lie that salvation by grace through faith is a license to sin. Both of them are ministers of Satan.
The whole idea of "be good and do good" but erasing God out of the picture of a fatal doctrine. The rich young ruler was told that there was no one good but God. Instead of saying that he couldn't keep the whole Law, he lied that he kept it all since childhood. The moment Jesus told him to sell everything and follow him became this turning point that nobody can keep the whole Law. It's not about adding works to getting saved or staying saved but it's all about that you can't keep the whole Law. James 2:10-11 shows that even one sin is more than enough to damn people to Hell forever.
The problem of "moral reformation without God" is that it's a menstruation rag (Isaiah 64:6) because all men are sinners. Romans 3:10-19 shows just how condemned and screwed up mankind has become without God. The problem of the so-called moral reformation of today is that it has a very different view of morality from God. Many people think as long as their good works exceed their bad works then they're going to Heaven. That kind of crooked thinking goes against God's pure and sinless holy character. Many people today believe they're saved by works but end up living like they have a license to sin showing the failure of a moral reformation without God. Many people attempt just everything to get rid of crime and corruption but fail because they ignore their need for God's grace to have a true moral reformation.
The Bible's moral reformation is radically different as it's grace oriented. Philippians 2:12-13 commands Christians to work out and not to work on their salvation that it's God that works in them to do better. Titus 2:11-14 and Ephesians 2:8-10 shows that true moral reformation is by God's grace which teaches men to live godly lives in this world. If you want real change then the Gospel must come first, people must be warned about sin, Hell and judgment before the Good News can even work in their lives. Christians have moral reformation not to get saved or to stay saved but it's all because they're already saved.